Refactoring with Design Patterns

Refactoring with Design Patterns Qafoo GmbH January 25, 2014

Me I

Working at Qafoo

We promote high quality code with trainings and consulting

http://qafoo.com I

Doctrine Developer

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Symfony Contributor

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Twitter @beberlei and @qafoo

Motivation

Neglecting Object-Oriented design leads to underengineering

Motivation

but focusing soley on Design-Pattern leads to overengineering

Refactoring

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small changes to internal code structure

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Apply extract method and class again and again

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See Matthias Verraes talk tomorrow, 16:10

Refactoring and Patterns

Refactoring towards Patterns to avoid both under- and overengineering.

Code

http://qa.fo/phpbnl14

Factory

A factory creates an object for you. I

Getting control over object creation

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Most important issue for every code-base Actually 4 patterns

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Factory Factory Method Abstract Factory Builder

Facade

A facade provides a simplified interface to a larger body of code. I

Make code reusable (business logic, ..)

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Integrate third party code (libraries)

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Avoid hard dependencies on technical details

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Strongly Related to the Adapter/Bridge patterns

Strategy/Policy Pattern

Strategy allows to exchange algorithms at run time. I

Object-oriented switch statement

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When calculations are changing frequently

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Or when they change based on state

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Construction of strategies often combined with a factory

https://joind.in/10287